Multiple-joint-grinding machine



Nov. 15, 1927.

A. w. MARTIN ET AL MULTIPLE JOINT GRINDING MACHINE E 3 Sheets-Sheet 1 Filed July IN V EN TORS.

- HLBEKT MfiKT/N- ATTORNEYS,

Nov. 15, 1927.v 1,648,991

A. w; MARTIN ET AL MULTIPLE JOINT GRINDING MACHINE Filed July 6, 1925 I 3 Sheets-Sheet 2 4 l A I v 2/ Tfi s 4- v f a/ ATTORNEKS Nov. 15, 1927 A.-W. MARTIN ET AL MULTIPLE JOINT GRINDING MACHINE Filed July 6, 19 .5 3 Sheets-Sheet 3 mm A TTORNEYS,

' omitted.

Patented Nev. 15, 1927.

parts!) STAT-ES PATENT GFFICE.

ALBERT 'W. MAR-TIN AND JACOB N. MARTIN, OF INDIAIIAFDLI5, INDIAFJA.

MULTIPLE-JOINT-GRINDING- IlvIACll-EINE.

Application filed July 6, 1925. Serial No. 41,757.

'ihe object of this invention is an im provement in the multiple grinding of joints or the ends of pipes or like articles. 'ljheinvention consists in mounting aplurality or grinding laps and spindles in a frame movable into position over a multiplicity of joints or pipes for grinding the same, and means r simultaneously giving the laps both rotary and gyratory move ment, whereby the grinding \'ill be facilitated and smooth joints or surfaces will he produced because of the cross grinding due to the gyratory movement of the laps in addition to the rotary movement. Said means is such as to rotate the individual laps and spindles and atthe same time move the trains, in which the spindles are mounted by universal joints, in circular paths so as to give the desired gyratory movement to the laps and spindles. Also the spindles are mounted in the frame carrying the same so that they have oscillatory movement, each spindle being mounted in a ball which turaishes a substantially universal hearing and at the same time has means for rotating the same when in any position. To the fore going end the frame in which the lap spindles are mounted has a horizontal circular swinging movement over a stationary plate or frame which is fixed in relation to the joints or pipes to be ground and thishori- Zontal circular swinging movement of "the frame carrying said spindles is effected by the same, means which rotates the individual spindles. i

The invention is not, however, limited to grinding pipe joints or employing multiple grinding elements although the invention was made for the purpose of grinding pipe joints. I

The full nature of the invention will he understood from the accompanying drawings and the following description and claims:

in the drawings, Figure 1 is a perspective view oi themachine before the carrier containing the grinders has been moved upinto operativeposition over the pipes, parts of the device being omitted. 2 is a similar view of the apparatus after the carrier of the grinders has been moved up into operative position and showing the machine in operation, earl: of the device being Fi 1 a plan view of the grind er head or carrier. l is a vertical central section on the line 4E'-l or Fig. L). Fig. 5 is a section onthe line 5 5 of Fig. 3, showing one grinder in its mounting, rest being broken away, and showing the grinder in its idle and vertical position. Fig. 6 is the same as 5, showing the position of the grinder in operation and gyratory positions of the grinder being indicated by dotted lines. Fig. '2' is a reproduction 01 the right-hand end of Fig. l, on a largerscale. 8 is th same as Fig. 7 with the parts in alteret position. Fig. 9 is a section on the line 9-9 of Fig.

4. of 6. Fig. 11 is a' section on the line 1111 of Fig. 6. Fig. 12 is a central vertical section of a modified form of lap pindle and its mounting, with the spindle in its idle position. Fig. 13 is the same with the spindle in operative position, and dii'lerentpositions of the spindle and lap being shown by dotted lines. Fig. 14 is a diagram showing in plan the gyratory movement of the grinding element, the lap and spindle. Fig. 15 is avertical cross section on the line 1515 of Fig. 1.

A plurality of steam pipes 15 is shown in Fig. l, mounted in a clamp, 16. The machine shown herein is adap'ted to grind simultaneously the ends of a large number of steam pipes which are arranged together in cross rows and substantially equidistant from each other. Means not shown hold the group of steam pipes in place while being ground.

The means for grindin the ends of the steam pipes are mounted on a carriage 17 in the form of a plate supported by end frames 18 carried by wheels or rollers 19 that travel on tracks or guideways 200, as shown in Fig. 1, whereby the mechanism is moved over the group of steam pipes for grinding the same and moved away therefrom after they are ground. The plate 17 is cut out at 18, see Fig. '3, so as to form two longitudinal and parallel openings therethrough so that it is in the nature of a frame plate and the spindle carrying frame is supported there on, as shown in 1, and so as to have a gyratory movement, as hereafter explained. The spindle frame consists of a bottom plate 20, a parallel top plate 21, and intermediate side plates 22, as shown in Figs. t and 5. The lap spindles are mounted on the lateral portions or said trams, as shown Fig. 10 is a section on the line 10-10 in Fig. 3, by the means shown'in Figs. and 6. Bushings 23 are secured in round holes or openin s in the plates and 21., which register with each other, as shown in Fig. 3, in which the hub 24 or a spur gear 1s mounted. There are two members to each hub 24:, an upper member and a lower me1nher that have flat sides which meet each other and the spur gear 25 is a ring secured tightly on said abutting hub members so that when assembled they are a fixed unit. The two hub members 2 1- are centrally and circularly bored out to form a seat for a bearing ball 26 in which the lap spindle device is mounted vertically as shown. This arrangement is to enable the lap to be given a g ratory movement, substantially as shown in Figs. 2 and 6. Pins 27 extend radially from opposite sides of the bearing lall 2" into verti- :al recesses 28 in the hub members 2d of the gear 25 to enable the lap to be oscillated as shown in Fig. 6. With this oscillatory movement the ball 26 oscillates on two hori- Zontal axes and the walls of the slots 28 limit raid oscillatory movement of the grind as. One of these axes is through the pins 27 and the other is at rightangle to the axis through the pins 27. seen in Fig. 11, is only slightly greater than .he pins 27. Consequently the ball does not turn on a vertical axis independently oi? the gear 25. Therefore, the turning movement oi the grinders is ellected by the gear 25 which carries the ball 25 with it, but durng such turning movement, the ball and grinders may rock, as shown in Fig. (3, on a horizontal aI-"s to a. limited extent.

The gears 25 ot' the various grinders are rotated in the direction of the arrows in Fig. 3 simultaneously by power coming from a motor 30, see Fig. 1 through a motor shaft 31, see Figs. and l, and gear 82 mounted on a sleeve 33 carried by said motor shaft and lying )etween the plates 20 and 21 in position to mesh with the two gears 25 on opposite sides of the gear 32, shown in Fig. As seen there are two series of 25 and they are in mesh with each other in succession so that all of them in each series are driven by the gear-'25 which meshes with the driving gear 82. This causes all of the grinders in the machine to be simultaneously actuated. The motor is mounted on a rod 35 carried in slots 36 in the upper ends of uprights 37 secured to and extending from the grinder carr tl'ran'ie. as seen in Figv 1.

The shaft 31 has a collar 38 thereon which rides upon the bushing 33 and which aids in holding it in position, hough said parts 31, S3 and 32 are secured rigidly together in oi that the shaft may inrp 't power cons nly to the gear. and thereby the grinder driving w reels are all constantly perated.

The grinder and its mounting is shown in The width of the slots 28,

Figs. 5 and It consists of a grinder head 40, having a round central socket at 1-1 on the underside thereof in which a shank 42 of a lead lap grinder 43 is secured by a screw or bolt 4 1-. The head has extending up centrally from ita spindle 45, the upper end of which projects partially through a tube l5 and is supported therein by a disk L17 secured on the stem by a screw 48 and resting on a shoulder if in the tube 4:6 made by boring out the upper end of the tube to form the enlarged port 50. This renders the screw 48 accessible for assembling and disassembling the part The grinder is held in its upper and idle. position in the frame formed of the plates 20 and 21 by a latch plate 51 which is pivoted on the plate 21 by a screw 52 and has a notch at 53 in the side thereoil' for engaging the squared plate 5 1 of the sleeve 16, as seen in Fig. 5. The latch 51 has a finger piece 55, as shown, whereby it can be moved into the holding position shown in Fig.

Vl hcn the group of spindles and the cariagc supg iort ng the same are moved from chown in 2, over the ends of the steam apes to lze ground, the grinders are dropped nd moved into the grindi 1g position shown :1 Fig. (3., so that the laps 43 will engage the tpper ends of the pipes 15, as seen in Fig.

This is done by releasing the latches 01 y hand, tl owing them into the position siown in Fig. 6. Then the grinder spindles 11 will move oown by gravity, or can be moved down by hand, ire-in the position shown in Fig. 5 to that shown in ('3. The cenral opening in the ball 26, is rectangular, as shown in Fig. 10, so that when the hall 26 and the squared lower plate 5 1; of the sleere 46 are in corresponding positions, as shown in Fig. 1, it will phi-'5 down through the ball 26, and it is pres--ted down below the same by hand and then the sleeve 46 is turned 'iorty-.liive degrees, whereupon the spring 57 will push the squared part 5 1 up into the squared recess in the bottom of the ball 26. to be seen in Fig. 5, and also shown in Fig. 10. The notches 58 are small triangular notches at each side of the opening 56, as seen in Fig. 10. hen the squared end of the sleeve 46 thus lies; into the notches 58, it is obvious that the rotation ol the gear 25 and ball will cause the rotation of the grinder. The spring 57 is a spiral spring surroundin. at its lower end bears 1 and in a end bears l reduced lower end of sleeve 46 below and spilt u from the squared plate 54 on the -16 so as to permit the la 51 to be moved into the position shown in Fig. 6.

The membeof the hub of the gear as shown in Figs. 5 and b, are cut away cen- Uri he position shown in Fig. 1, to the position trally and conically on the upper side and on the under side, as shown, to permit the oscillatory movements of the grinder spindle which, as stated, can oscillate in two directions on the horizontal axis of the ball 26.

The rotation of the grinding laps 4t?) is caused by the gearin heretofore explained which constantly rotates the gears 25. The means for causing the gyratory moven'lent of the grinders will now be explained. As shown in 3 and l, the middle portion of the plate 17 is recessed at in two places near the ends to receive a wrist pin 66 eccentrically secured to an internal gear 67 rotatably mounted on the lower end of a hub 68 of a gear 69 and concentric therewith. The upper end of the hub (58 is mounted in the plate 21. The gear 69 lies between the plates 20 and 21, and meshes with gears 25 on each side thereof, as seen in Fig. 3, so to be driven thereby. A fixed gear 70 is eccentrically mounted on thehub 68 of the gear 69, as shown in Figs. 7 and 8, and meshes with the internal gear 67. The gear 70 is held stationary by a plate 71 which 1s provided with a flat sided opening 7 2 in it, as seen in Fig.9, so thatsaid plate tits astride the flattened hub 73 of the gear '70, and the end of the plate 71 is held in place by a screw 74: passing through the plate 20. This arrangement enables said parts to be assembled and disassembled readily.

From the foregoing explanation it will be seen that gear 69 rotates on the stub shaft which has an eccentric arranged to give a bodily rotative movement to gear 70, which being held against rotation about its own axis, and being in mesh with internal gear 67, causes said last-mentioned gear to rotate about the axis 68. The eccentric 66 on gear 67 rotates about the axis 68, also giving relative circular bodily movement of the spindle frame 2021 relative to the carriage 17. The carriage being the immovable memher, a circular bodily movement is transmitted to the spindle frame. Each spindle, therefore, has a gyratory movement as shown in full lines, and various other positions by dotted lines, in Fig. 14. This gives to the frame carrying the grinders, as a whole, a constantly changing gyratory movement, as indicated in Fig. 2, which causes a constant rotation of the vertical plane of the angle between the grinder spindles and the axes of the pipes 15 being ground about said axes. This causes con stant cross grinding of the ends of the pipes and a uniform grinding of all parts thereof and prevents striee or rings and thus smoothly grinds the ends of the pipes. During this movement the grinding laps are all held yieldingly in engagement with the ends of the pipes by the springs 57. When the process is finished, the laps are all lifted and latched in position, as shown in Fig. 5, and

the mechanism rolled out of the way from over the ends of the pipes.

The lap is preferablyformed as-shown in Fig. 5, with circular chamber in the upper portion thereof surrounding the head il) for holding abrading material such as line emery in solution, and said chamber 80 communicates with the inner grinding surface of the lap through small passages 81, whereby the lap is conveniently supplied with abrading material.

A. modified form of spindle construction is illustrated in Figs. 12 and 13, which is somewhat simpler than that shown in Figs. 5 and 6. The latch plate 51, shown in Fig. 5, is omitted and in its place there is a loose plate resting upon the frame plate 21. The tube 4:65 of the spindle extends through the plate 85 loosely and through a loose sleeve 86 which rests loosely upon theplate 85. The sleeve 86 extends for about half the distance of the tube 46 and at its upper end is notched at 87 to receive pins 88 which extend laterally fromopposite sides ofthe tube 46 and thereby the latch and spindle and tube ttl are held in their upper and idle position, that is, in the. same position as in'Fig. 5. The sleeve 86 is vertically slotted at 89 on opposite sides from the top almost to the bottom, and by turning the sleeve 86 or thetube d6, the pins 88 are brought into registry with the slots 89 and that will permit the spindle and lap to be moved downward to the operating position, as shown in Fig. 13, the same as in Fig. 6. Otherwise the mechanism in the modified form shown in Figs. 12 and 13 is the same as that shown in the other figures excepting that the collar 60 shown in Fig. 6 is omitted in the form shown in Figs. 12 and 13, and the spring 57 at its upper end bears directly against the square collar 54. The hole in plate 85 is large enough to permit the oscillation and gyratory movement of the spindle.

By gyratory herein is meant the movement of the spindle in a direction around the periphery of a cone with the apex down inasmuch as the pipe joint or other article being ground remains fixed during the grinding and the lap on the lower end of the spindle is held from lateral movement thereby while the upper end of the spindle is given a circular swinging movement by a circular bodily movement of the spindle fame 20- -21.

The invention claimed is:

1. A multiple joint grinding machine for simultaneously grinding the ends of a plurality of pipes rigidly mounted in a stationary work holder including a grinding lap and spindle for each of said pipes, a carriage movable into and out of position over said pipes, a frame carried by the carriage in which the grinder spindles are each mounted by a universal joint, and means for simultaneously rotating the grinder spindles and giving the frame a circular movement relative to the carriage whereby said lap and spindle Will be given simultaneous gyratory and rotary movements, substantially as set forth.

2. A multiple joint grinding machine, as set forth in claim l,.\vith a single power supplying means mounted on the carriage "for both rotating the grinder spindles and giving the frame a circular movement relative to the carriage whereby each lap and spindle will be given simultaneous gyratory and rotary movements.

3. A multiple joint grinding machine for simultaneously grinding the ends of a plurality of pipes rigidly mounted in a stationary Work holder, including a grinding lap and spindle for each of said pipes, a car riage movable into and out of position over the pipes, a frame in Which the grinder spindles are each mounted by a universal joint, means carried by the frame l'or rotating all the spindles, rotary means carried by the frame, means driven by said rotary means having an eccentric portion engaging the carriage, whereby the frame is given a circular movement relative to the carriage, and

each lap and spindle is given simultaneous rotary and gyratory movements.

i. A multiple joint grinding machine, as set forth in claim 8, with means driven by the means which rotates the grinders for op erating the means carrying the eccentric portion for causing the circular movement of the frame simultaneously with the rotary movement of the grinders.

5. A multiple joint grimling machine, as set forth in claim said frame having a plurality of bearings Wi h gears mounted there-- in, one for each grinder spindle and said gears meshing with each other, a ball loosely mounted in the center of each gear for centrally carryin one of the grinder spindles, and means for yieldingly forcing each grinder into engagement With the end of the pipe being ground While the machine is in use, whereby the grinders will operate cons'liantly dui' g the gyratory movement of the :l'rame cari mg the. same.

in Witness whereof, We have hereunto atiixed our signatures.

ALBERT M. MARTIN. JACOB N. MARTIN. 

